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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e2c5495d64bb9700efd9ad8f99a19a8fdcc28d0faa787c5db7856d588085c3' 
  AND token = '8hNNqzw5F9A12X5UzQkFqPNbcPhQi9QCN++0+pAgayg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}